To begin with, the concept of dietary fiber must be clarified. It is an edible part of plants that resists digestion and absorption in the human small intestine and undergoes partial or total fermentation in the large intestine.

From a nutritional point of view, dietary fiber is not a nutrient, since it does not participate in basic metabolic processes of the body. However, it performs several very important physiological functions.

Dietary fiber is part of the structure of plants, so it is only found in plant foods such as vegetables, fruits, legumes and cereals. It is considered a complex carbohydrate and is divided into two types: insoluble fiber and soluble fiber.

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